152 BULLETIN 50, UNITED STATES NATIONAL IiIUSEUM 



that at posterior end of nostril, where its width is equal to about two- 

 thirds its depth at same point; culmen about three-fifths as long as 

 tarsus, slightly elevated basally and faintly depressed above anterior 

 end of nostril, thence gradually and increasingly decurved to tip; 

 gonys decidedly shorter than mandibular rami, nearly straight, 

 strongly ascending terminally, its basal angle distinct; mandibular 

 rami with a very indistinct narrow lateral groove; nasal fossa very 

 distinctly defined, extending about half way from edge of loral 

 feathering to tip of maxilla : nostril narrowly elliptical, parallel with 

 maxillary tomium ; anterior edge of loral feathering forming a nearly 

 vertical slightly, but distinctly, convex line from side of base of cul- 

 men at upper edge of nasal fossa to rictus, the slightly expanded base 

 of culmen forming a broadly angular short indentation in edge of 

 median portion of forehead; malar antia about on line with latero- 

 frontal antia, the mental antia slightly posterior to proximal end of 

 nostril. Wing moderate in size, very concave beneath, much rounded, 

 the longest primaries exceeding distal secondaries by only about one- 

 fifth the length of wing but extending decidedly beyond tips of the 

 slightly elongated proximal secondaries; third and fourth, or third, 

 fourth, and fifth primaries longest, the first (outermost) shortest 

 (about as long as distal secondaries) ; alula with longest feather ex- 

 tending decidedly beyond tips of longest primary coverts. Tail 

 slightly more than two-fifths as long as wing, strongly rounded, the 

 rectrices soft, with lax webs, not extending beyond tips of lower 

 coverts. Tarsus more than two-fifths as long as wing, the acrotarsium 

 with a single series of about ten broad transverse scutella, the planta 

 tarsi with several transverse scutella near heel joint, otlierwise with 

 an irregular arrangement of smaller, more hexagonal scales; middle 

 toe, without claw, a little shorter than tarsus; outer toe with claw 

 reaching to base of middle claw or falling very slightly short, the 

 inner toe, without claw, reaching to penultimate articulation of 

 middle toe; hallux, without claw, about as long as basal phalanx of 

 outer toe; claws relatively small, much compressed, moderately 

 curved, acute. 



Plumage and coloration. — Plumage full, dense, and blended, shorter 

 anteriorly, longer and more lax posteriorly ; primaries broad, the outer 

 ones, especially the first, bowed or incurved ; slightly elongated proxi- 

 mal secondaries soft, very broad, with rounded tips. Pileum and sides 

 of head plain slate color; rest of upperparts deep rufescent on hind 

 neck gradually changing to sepia or bone brown on remiges, the tail 

 darker; underparts plain cinnamon-rufous, paler on abdomen. 



Range. — Central America. (Monotypic.) 



